20190276 Ver 1_More Info Received_20190416

Mitchell, Robert K
From: Anna Priest <[e-mail]>
Sent: Tuesday, April 16, 2019 4:44 PM
To: Mitchell, Robert K
Cc: Clement Riddle; Leslie, Andrea J; Brown, David W CIV USARMY CESAW (US)
Subject: [External] Re: Request For Additional Information High Hampton Dam Repairs - DWR#
20190276 -Jackson
Attachments: Exhibit 1 -Anchor QEA Cofferdam Detail.pdf; Figure 5 - Revised Impact Map.pdf
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Kevin,
Please find attached Exhibit 1 -Anchor QEA Cofferdam Detail drawing to address your comment 1 in the email
below.
I have also attached a revised Figure 4 -Impact Map with an updated access road and impact area. After a
recent site visit we determined that the original access road was too steep for a large machine to access,
therefore we have altered the proposed route to go through a dewatered portion of the lake bed, increasing
our temporary impact by 0.01 acres.
Please let me know if you have any further questions or comments.
Thank you,
Anna Priest, PWS
ClearWater Environmental Consultants, Inc.
32 Clayton St
Asheville, NC 28801
828.698.9800 x 301
From: Mitchell, Robert K <[e-mail]>
Sent: Wednesday, March 27, 2019 11:54 AM
To: Anna Priest
Cc: Clement Riddle; Leslie, Andrea J; Brown, David W CIV USARMY CESAW (US)
Subject: Request For Additional Information High Hampton Dam Repairs - DWR#20190276- Jackson
Anna,
On March 1, 2019, the Division of Water Resources (Division) received your application dated February 28, 2019,
requesting a 401 Water Quality Certification from the Division for the subject property. The Division has determined
that your application is incomplete and cannot be processed. The application is on -hold until the following information
is received:

1. The application states that during lake drawdown of High Hampton Lake, the construction area will be isolated
from the stream bed so that the work is performed in the dry. Please provide a typical and construction
sequence that shows how the work will be completed in the dry.
Pursuant to Title 15A NCAC 02H .0502 (c), the applicant shall furnish all of the above requested information for the
proper consideration of the application. If all of the requested information is not received within 30 calendar days, of
receipt of this email, the Division will be unable to approve the application and it will be returned. The return of this
project will necessitate reapplication to the Division for approval, including a complete application package and the
appropriate fee.
You may provide your response via email or mail to the address noted below.
Should you have any questions regarding these matters, please contact Kevin Mitchell at [phone] or
[e-mail].
Kevin Mitchell
Environmental Specialist—Asheville Regional Office
Water Quality Regional Operations Section
NCDEQ— Division of Water Resources
828-296-4650 Office
Email [e-mail]
2090 U.S. Hwy. 70
Swannanoa, N.C. 28778
=`Nothing Compares
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North Carolina Public Records Law and may be disclosed to third parties.
Thank you Anna—I have some clarifying questions on what we are calling questions 2a and 2b:
What I really mean is how will you keep the area of work at the valve dry and isolated from flows? The map
provided with the pump around system is a start but doesn't demonstrate how flows will be kept away from
the work area. E.g., will there be a coffer dam that isolates the work area? I would like to see a schematic that
shows this. The intake that I ask about in 2b is where the water will be pulled via the pump around system,
not the irrigation system. As mapped in Figure 5, it seems that you are assuming a defined channel with water
flow through the dewatered sediments that ends up at the pump around intake. Am I understanding this
correctly?
Thanks,
Andrea
Andrea Leslie
Mountain Habitat Conservation Coordinator
NC Wildlife Resources Commission

645 Fish Hatchery Rd., Building B
Marion, NC 28752
828-803-6054 (office)
828-400-4223 (cell)
www.ncwildlife.org
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From: Anna Priest <[e-mail]>
Sent: Thursday, March 14, 2019 1:31 PM
To: Leslie, Andrea J <[e-mail]>
Cc: Brown, David W CIV USARMY CESAW (US) <[e-mail]>; Mitchell, Robert K
<[e-mail]>
Subject: [External] Re: High Hampton Dam project - questions
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Andrea,
Thank you for your request for more information. Please find my responses to your questions below:
WRC question 1a: Can you provide some additional information on the High Hampton lake? A map
would be useful, providing the location of the valve repair, area of dredging and access to that site,
and pump around system.
Please refer to Figure 3 in the PCN package. This figure indicates the proposed access road and location of the
gate valve to be repaired. I have attached an additional Figure 5 which indicates the proposed dredging area
adjacent to the gate valve for repair work and the proposed location of the pump around system. I have also
attached photographs of the High Hampton dam and valve to be repaired for reference.
WRC question 1b: Is the dam a top flow dam, with no outlet structure? If there is an additional outlet
structure, please describe what type, where it is, and if it will be used at all during this project.
The High Hampton Dam is a top flow dam with a gate valve and outlet structure that will be repaired. There is
no additional outlet structure that will be used during this project, excluding the pump around system.
WRC question 2a: How will water be pumped over the dam after levels have been lowered for
work?
Please refer to Appendix A (bullet point 5) in the PCN package for details regarding the pump around system
and work sequence. The document states: "Once the lake is lowered, the contractor shall maintain minimum
base flow at all times to the stream of 0.475 cubic feet per centimeter (cfs) (7Q10). The minimum base flow
shall be accomplished by using either a mechanical pump or siphon system (or a combination of both) that will
operate throughout the maintenance and refilling process."
WRC question 2b: Where will the water intake be located? We recommend that it be located
upstream of the work area, ideally at the head of the lake.

The proposed location of the water intake structure for golf course irrigation is indicated on the attached Figure
5 which is upstream of the work area.
WRC question 3: I am trying to understand what is being done at High Hampton lake. The PCN
states that a water intake structure for irrigation will be installed. Is this the same as the "valve" that
will be replaced or is the replaced valve associated with another structure?
The water intake structure replacement is separate from the gate valve located at the dam. Please refer to
attached Figure 5.
WRC question 4: Will any of the work proposed involve the construction of the water control system
for Hampton and Jewel Lakes described on p. 6 of the October 4, 2018 "High Hampton
Redevelopment Project WRC Response Comments" (attached)?
Yes, the water intake structure will include a water control system per the October 1, 2018 letter from
C1earWater.
Please do not hesitate to contact me with any additional comments or questions.
Best regards,
Anna Priest, PWS
C1earWater Environmental Consultants, Inc.
32 Clayton St
Asheville, NC 28801
828.698.9800 x 301
From: Leslie, Andrea J <[e-mail]>
Sent: Wednesday, March 13, 2019 11:04 AM
To: Anna Priest
Cc: Brown, David W CIV USARMY CESAW (US); Mitchell, Robert K
Subject: High Hampton Dam project - questions
Hi Anna,
I have a few questions on the High Hampton dam project:
1. Can you provide some additional information on the High Hampton lake? A map would be
useful, providing the location of the valve repair, area of dredging and access to that site, and
pump around system. Is the dam a top flow dam, with no outlet structure? If there is an
additional outlet structure, please describe what type, where it is, and if it will be used at all
during this project.
2. How will water be pumped over the dam after levels have been lowered for work? Where will
the water intake be located? We recommend that it be located upstream of the work area,
ideally at the head of the lake.
3. I am trying to understand what is being done at High Hampton lake. The PCN states that a
water intake structure for irrigation will be installed. Is this the same as the "valve" that will
be replaced or is the replaced valve associated with another structure?

4. Will any of the work proposed involve the construction of the water control system for
Hampton and Jewel Lakes described on p. 6 of the October 4, 2018 "High Hampton
Redevelopment Project WRC Response Comments" (attached)?
Thank you,
Andrea
Andrea Leslie
Mountain Habitat Conservation Coordinator
NC Wildlife Resources Commission
645 Fish Hatchery Rd., Building B
Marion, NC 28752
828-803-6054 (office)
828-400-4223 (cell)
www.ncwildlife.or�
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IMPERVIOUS I
ANCHOR MEMBRANE Uu
SANDBAGS AS NEE[
PUMP A
XCAVATE AS NEEDED TO PROVIDE
DDITIONAL PUMP SUBMERGENCE
TALL COFFERDAM AS SHOWN BELOW
NEEDED, USE ADDITIONAL PUMP TO
WATER WORK AREA, SEE NOTES
,MPTON LAKE DAM, WORK AREA
R AROUND WORK AREA
/ HEIGHT NOT TO EXCEED 3'
)RK AREA
SAND BAGS OR BIG BAGS
NOTES:'"
THIS PUMP -AROUND DETAIL WAS PREPARED FOR THE CONVENIENCE OF THE CONTRACTOR, THE CONTRACTOR SHALL PREPARE AND
SUBMIT DETAILS OF THEIR DESIGN AND SHALL BE RESPONSIBLE FOR CONTROL OF WATER IN THE WORK AREA.
INSTALL IMPERVIOUS MEMBRANE ON THE UPSTREAM SIDE OF THE SANDBAG COFFERDAM. WEIGHT IMPERVIOUS MEMBRANE TO THE
SANDBAG COFFER DAM AND TO THE STREAM BED WITH ADDITIONAL SANDBAGS ON TOP OF THE MEMBRANE.
SOME EXCAVATION CAN OCCUR UPSTREAM OF THE COFFERDAM TO PROVIDE ADDITIONAL CAPACITY AND A LOW POINT TO PUMP
FROM.
IF LEAKAGE OCCURS THROUGH THE COFFERDAM, A PUMP CAN BE PLACED BETWEEN THE COFFERDAM AND WORK AREA TO PUMP
WATER BACK ABOVE THE COFFERDAM, OR BELOW THE WORK AREA IF TURBIDITY REQUIREMENTS ARE MET.
A GEOTEXTILE BAG OR OTHER METHODS MAY BE REQUIRED TO CONTROL TURBIDITY AND MEET REGULATORY REQUIREMENTS.
INSTALL VELOCITY DISSIPATION WHERE THE PUMPED WATER IS DISCHARGED IF THE POTENTIAL OF EROSION EXIST. IF THE WATER IS
DISCHARGED INTO A DEEP POOL OR ONTO BEDROCK, VELOCITY DISSIPATION MAY NOT BE NECESSARY.
A MINIMUM BASE FLOW OF 0.475 CUBIC FEET PER SECOND (CFS), APPROXIMATELY 213 GALLONS PER MINUTE (GPM) IS TO BE
MAINTAINED IMMEDIATELY BELOW THE WORK AREA PER REGULATORY REQUIREMENT. CONTRACTOR TO VERIFY FLOW RATE
REQUIREMENT IS MET IN FIELD WITH FLOW METER OR OTHER METHOD.
WHEN WORK IS COMPLETE, THE COFFERDAM SHALL BE REMOVED IN ITS ENTIRETY.
THIS PLAN WAS PREPARED WITHOUT THE BENEFIT OF A SURVEY. ALL PROPOSED IMPROVEMENTS SHALL BE VERIFIED IN THE FIELD
PRIOR TO INSTALLATION.
Publish Date: I User: W. EDSEL NOT TO SCALE
Filepath: \\asheville1\asheville\Projects\Daniel Corp\High Hampton\CADD\AQ-Titleblock-2017-SegoeUl.dgn
ANCHOR EXHIBIT 1
QEA HIGH HAMPTON DAM VALVE REPLACEMENT
SANDBAG COFFERDAM PUMP -AROUND SYSTEM

High Hampton (+/- 674 AC)